Apologies if this is a thread that has been done to death before.

I was asked by a work colleague yesterday as to what exactly Zen was.

Rather than give him an explanation, I simply said that the words I gave would be meaningless as they would never be able to convey what it is like to practice such a path (whenever I give an explantion when asked it always comes out sounding like nonsense it seems). I said that if he was interested in Zen then he should try it out for himself to see what it means.
I was wondering, how would you describe Zen if someone asked the question?